title: Necrotizing myositis causes restrictive hypoventilation in a mouse model for human enterovirus 71 infection.
abstract: BACKGROUND
  Enterovirus 71 (EV71) infections are associated with a high prevalence of hand, foot and mouth disease (HFMD) in children and occasionally cause lethal complications. Most infections are self-limiting. However, resulting complications, including aseptic meningitis, encephalitis, poliomyelitis-like acute flaccid paralysis, and neurological pulmonary edema or hemorrhage, are responsible for the lethal symptoms of EV71 infection, the pathogenesis of which remain to be clarified.
  
  
  RESULTS
  In the present study, 2-week-old Institute of Cancer Research (ICR) mice were infected with a mouse-adapted EV71 strain. These infected mice demonstrated progressive paralysis and died within 12 days post infection (d.p.i.). EV71, which mainly replicates in skeletal muscle tissues, caused severe necrotizing myositis. Lesions in the central nervous system (CNS) and other tissues were not observed.
  
  
  CONCLUSIONS
  Necrotizing myositis of respiratory-related muscles caused severe restrictive hypoventilation and subsequent hypoxia, which could explain the fatality of EV71-infected mice. This finding suggests that, in addition to CNS injury, necrotic myositis may also be responsible for the paralysis and death observed in EV71-infected mice.
authors.forename: Jing-hui
authors.initials: JH
authors.lastname: Xiu
authors.forename: Hao
authors.initials: H
authors.lastname: Zhu
authors.forename: Yan-feng
authors.initials: YF
authors.lastname: Xu
authors.forename: Jiang-ning
authors.initials: JN
authors.lastname: Liu
authors.forename: Xian-zhu
authors.initials: XZ
authors.lastname: Xia
authors.forename: Lian-feng
authors.initials: LF
authors.lastname: Zhang
mesh_terms: D000818:Animals; D003643:Death; D004195:Disease Models, Animal; D029821:Enterovirus A, Human / Q000502:physiology*; D004769:Enterovirus Infections / Q000150:complications / Q000473:pathology* / Q000821:virology; D054884:Host-Pathogen Interactions; D007040:Hypoventilation; D000860:Hypoxia; D008813:Mice, Inbred ICR; D009220:Myositis / Q000150:complications / Q000473:pathology* / Q000821:virology*; D010243:Paralysis